linux-stable.git/rust/kernel/alloc, branch v7.1.5

rust: alloc: fix assert in `Vec::reserve` doc test

2026-07-24T14:20:00+00:00

[ Upstream commit 75619f2df7a5da6ffb61eedc2a73fdf70c65471c ]

The assert in the doctest used `>= 10`, which only checks that the
capacity can hold `additional` elements, ignoring the existing length
of `v`. The correct check should ensure there is room for `additional`
*extra* elements on top of what is already in the vector.

Fix the assert to use `>= v.len() + 10` so the example accurately
reflects the actual semantics of the function.

Reported-by: Miguel Ojeda 
Closes: https://lore.kernel.org/rust-for-linux/CANiq72nkXWhjK9iFRrhGtkMZGsvNE_zVsu4JnxaFRfxWL7RRdg@mail.gmail.com/
Fixes: 2aac4cd7dae3d ("rust: alloc: implement kernel `Vec` type")
Signed-off-by: Hsiu Che Yu 
Reviewed-by: Alice Ryhl 
Reviewed-by: Alexandre Courbot 
Link: https://patch.msgid.link/20260427-doctest-kvec-reserve-v1-1-0623abcd9c2e@gmail.com
Signed-off-by: Danilo Krummrich 
Signed-off-by: Sasha Levin

rust: alloc: fix `Vec::extend_with` SAFETY comment

2026-07-24T14:19:12+00:00

[ Upstream commit f497aae6ded43f91b1dbf29a35d7062823635640 ]

Fix an incorrect operator in the SAFETY comment, changing `<` to `<=`,
since `Vec::reserve` guarantees capacity for exactly n additional elements,
so the equal case should be included.

Signed-off-by: Hsiu Che Yu 
Reviewed-by: Alexandre Courbot 
Fixes: 2aac4cd7dae3d ("rust: alloc: implement kernel `Vec` type")
Link: https://patch.msgid.link/18fc8eee2f057a6bfbcadae156d1d0b7c40d0077.1777111268.git.yu.whisper.personal@gmail.com
Signed-off-by: Danilo Krummrich 
Signed-off-by: Sasha Levin

Merge tag 'char-misc-7.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc

2026-04-24T20:23:50+00:00

Pull char / misc / IIO / and others driver updates from Greg KH:
 "Here is the char/misc/iio and other smaller driver subsystem updates
  for 7.1-rc1. Lots of stuff in here, all tiny, but relevant for the
  different drivers they touch. Major points in here is:

   - the usual large set of new IIO drivers and updates for that
     subsystem (the large majority of this diffstat)

   - lots of comedi driver updates and bugfixes

   - coresight driver updates

   - interconnect driver updates and additions

   - mei driver updates

   - binder (both rust and C versions) updates and fixes

   - lots of other smaller driver subsystem updates and additions

  All of these have been in linux-next for a while with no reported
  issues"

* tag 'char-misc-7.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (405 commits)
  coresight: tpdm: fix invalid MMIO access issue
  mei: me: add nova lake point H DID
  mei: lb: add late binding version 2
  mei: bus: add mei_cldev_uuid
  w1: ds2490: drop redundant device reference
  bus: mhi: host: pci_generic: Add Telit FE912C04 modem support
  mei: csc: wake device while reading firmware status
  mei: csc: support controller with separate PCI device
  mei: convert PCI error to common errno
  mei: trace: print return value of pci_cfg_read
  mei: me: move trace into firmware status read
  mei: fix idle print specifiers
  mei: me: use PCI_DEVICE_DATA macro
  sonypi: Convert ACPI driver to a platform one
  misc: apds990x: fix all kernel-doc warnings
  most: usb: Use kzalloc_objs for endpoint address array
  hpet: Convert ACPI driver to a platform one
  misc: vmw_vmci: Fix spelling mistakes in comments
  parport: Remove completed item from to-do list
  char: remove unnecessary module_init/exit functions
  ...

rust: alloc: simplify with `NonNull::add()` now that it is stable

2026-04-07T08:00:24+00:00

Currently, we need to go through raw pointers and then re-create the
`NonNull` from the result of offsetting the raw pointer.

`feature(non_null_convenience)` [1] has been stabilized in Rust
1.80.0 [2], which is older than our new minimum Rust version
(Rust 1.85.0).

Thus, now that we bump the Rust minimum version, simplify using
`NonNull::add()` and clean the TODO note.

Link: https://github.com/rust-lang/rust/issues/117691 [1]
Link: https://github.com/rust-lang/rust/pull/124498 [2]
Reviewed-by: Tamir Duberstein 
Reviewed-by: Gary Guo 
Acked-by: Danilo Krummrich 
Link: https://patch.msgid.link/20260405235309.418950-15-ojeda@kernel.org
Signed-off-by: Miguel Ojeda

rust: remove `RUSTC_HAS_COERCE_POINTEE` and simplify code

2026-04-07T08:00:23+00:00

With the Rust version bump in place, the `RUSTC_HAS_COERCE_POINTEE`
Kconfig (automatic) option is always true.

Thus remove the option and simplify the code.

In particular, this includes removing our use of the predecessor unstable
features we used with Rust < 1.84.0 (`coerce_unsized`, `dispatch_from_dyn`
and `unsize`).

Reviewed-by: Tamir Duberstein 
Acked-by: Danilo Krummrich 
Reviewed-by: Gary Guo 
Link: https://patch.msgid.link/20260405235309.418950-11-ojeda@kernel.org
Signed-off-by: Miguel Ojeda

rust: kernel: mark as `#[inline]` all `From::from()`s for `Error`

2026-03-27T11:49:00+00:00

There was a recent request [1] to mark as `#[inline]` the simple
`From::from()` functions implemented for `Error`.

Thus mark all of the existing

    impl From<...> for Error {
        fn from(err: ...) -> Self {
            ...
        }
    }

functions in the `kernel` crate as `#[inline]`.

Suggested-by: Gary Guo 
Link: https://lore.kernel.org/all/8403c8b7a832b5274743816eb77abfa4@garyguo.net/ [1]
Signed-off-by: Alistair Francis 
Acked-by: Danilo Krummrich 
Acked-by: Andreas Hindborg 
Link: https://patch.msgid.link/20260326020406.1438210-1-alistair.francis@wdc.com
[ Dropped `projection.rs` since it is in another tree and already marked
  as `inline(always)` and reworded accordingly. Changed Link tag to
  Gary's original message and added Suggested-by. - Miguel ]
Signed-off-by: Miguel Ojeda

rust: alloc: add KUnit tests for KVVec shrink_to

2026-02-27T05:37:53+00:00

Add comprehensive KUnit tests for the shrink_to method for KVVec.
The tests verify:
- Basic shrinking from multiple pages to fewer pages with data integrity
  preservation
- Empty vector shrinking to zero capacity
- No-op behavior when shrinking to a larger capacity than current
- Respect for min_capacity parameter when larger than vector length
These tests ensure that the shrinking logic correctly identifies when
memory can be reclaimed (by freeing at least one page) and that data
integrity is maintained throughout shrink operations.

Reviewed-by: Alice Ryhl 
Acked-by: Danilo Krummrich 
Signed-off-by: Shivam Kalra 
Link: https://patch.msgid.link/20260216-binder-shrink-vec-v3-v6-2-ece8e8593e53@zohomail.in
Signed-off-by: Greg Kroah-Hartman

rust: kvec: implement shrink_to for KVVec

2026-02-27T05:37:53+00:00

Implement shrink_to method specifically for `KVVec` (i.e.,
`Vec`). `shrink_to` reduces the vector's capacity to a
specified minimum.

For kmalloc-backed allocations, the method delegates to realloc(),
letting the allocator decide whether shrinking is worthwhile. For
vmalloc-backed allocations (detected via is_vmalloc_addr), shrinking
only occurs if at least one page of memory can be freed, using an
explicit alloc+copy+free since vrealloc does not yet support in-place
shrinking.

A TODO note marks this for future replacement with a generic shrink_to
for all allocators that uses A::realloc() once the underlying allocators
properly support shrinking via realloc.

Suggested-by: Alice Ryhl 
Suggested-by: Danilo Krummrich 
Reviewed-by: Alice Ryhl 
Acked-by: Danilo Krummrich 
Signed-off-by: Shivam Kalra 
Link: https://patch.msgid.link/20260216-binder-shrink-vec-v3-v6-1-ece8e8593e53@zohomail.in
Signed-off-by: Greg Kroah-Hartman

rust: alloc: use `kernel::fmt`

2025-10-20T02:04:23+00:00

Reduce coupling to implementation details of the formatting machinery by
avoiding direct use for `core`'s formatting traits and macros.

This backslid in commit 9def0d0a2a1c ("rust: alloc: add
Vec::push_within_capacity").

Reviewed-by: Alice Ryhl 
Acked-by: Danilo Krummrich 
Signed-off-by: Tamir Duberstein 
Link: https://patch.msgid.link/20251018-cstr-core-v18-6-9378a54385f8@gmail.com
Signed-off-by: Miguel Ojeda

rust: alloc: employ a trailing comment to keep vertical layout

2025-10-16T22:56:20+00:00

Apply the formatting guidelines introduced in the previous commit to
make the file `rustfmt`-clean again.

Reviewed-by: Benno Lossin 
Signed-off-by: Miguel Ojeda